Fitted the 26"wheels to aus230 for testing, Will be fitted to new yacht when it is completed. The test on the wheels proved satisfactory, no signs of damage or stress to the rims, The yacht had a noticable gain in speed.
They are hand brakes, I dont think they are all that efficent with the larger wheels, they work fine with wheel barrow wheels. A question I have pondered is:- If a land yacht had independant rear wheel brakes, could they improve turning in tacks and gybes or just make the rear end spin out??
Maybe this question will be resolved at the upcoming blokart nationals at Yeppoon, first weekend in March as many blokarts now have the front brake. At the sandgropers club, they use the rear brakes for turning all the time, on their surface it it lookss very effective and was the reasion that I fitted them to my yacht.
With fully-faired racing recumbent trikes (HPVs) we have similar issues when the roll over at speed, particularly into corners. As an observation, you have put yours outside the triangle quite a lot with your seating position. Remember that the yacht is powered by a sail that applies a side load to the wheels ,which then roll forward in response.Ie it is not wheel driven.
Big narrow wheels give lowered rolling resistance, BUT if stood upright would peel off the rim due to the side load, or the rims would fail, BUT having heavier tyres and rims would give a flywheel effect, ruining the acceleration benifits of really light wheels. Landyachts ,in general have no suspension other than the flex of the tubes or axles( too heavy).The OTT style chassis(Over the top) compensates for this by having long flexible limbs that can ride out some serious bumps and dips. Many of the design features become un;neccessary on really smooth hard surfaces.Mind you these yacht on hard and smooth go scary fast! One of the things to consider with this top end style yacht is that they need to be custom built for for each pilot, to get all the balances right. And thats why , when we worked on a simple design for the beginner that would still go like a rocket, we followed the example of the blokart and went small. Just a thought ( my observations only) on wheel angles (camber) when any wheel has any angle of camber it actually loads up the bearings in a twisting motion with the inner and outer bearings actually fighting each other. Have a look at the alignment with all 3 wheels on the gound then raise one of the rear wheels 500mm and then re check and i think you will find the wheel on the ground its alignment has moved outward a bit and the yacht will be infact be crabbing a little. The only yacht i have done much sailing in that had castered wheels was a yacht called the "Rickshaw" many years ago at Mallala(It was a mini-mini with 20 inch bmx wheels and a 1.2m wheel base), i actually had to angle the wheels off true alignment to get the feel right.
The weight on the front wheel or lack of it may also be another major problem depending the surface you are on.
Two Lehigh students are building a wind-powered land yacht with hopes to break land speed records. Edward Stilson, '11, and Luke Yoder, '11, plan to take their vehicle to a competition in Nevada in 2011 with the help of other members of their club, the Land Yacht Speed Record club. The craft will use a large, rigid wing to capture wind power and will not use any internal motors, Stilson said.

So far, the club has built a tire testing rig which allows it to analyze results live and to test all types of tires, Yoder said.
This year, the club has started to build a one-third scale model of the craft, which it hopes to test in March 2009 at the competition site in Nevada, Stilson said.
The model will be steered with a remote control, giving direction to the front wheel and to a rudder-like wing at the back of the craft.
The race site will be a dry lake bed in Nevada, which will provide a large, hard, flat surface for the land yachts, Stilson said.
Building a Landyacht for DesignandTech Major Work - Land Yacht Sailing Construction - Seabreeze Forums!
Things have been done from fold out tents for utes , surfboards , wakeboards , tables , tv settings etc.
I have chosen a Landyacht because i live on a 17 kilometer beach and at low tide would be a great place to land yacht.For DnT there is also a requirement of a "innovation" so i decided that im going to incorporate skiis so when its high tide you can still go on the very soft sand.
I'm sure no one at your school would have read this forum, so just build a lefroy mini and claim it as your own design. Try the basics first rather than your hard earned time and money on the finished project, you will achieve more for yourself. It is a simple program and easy to learn and will help you greatly in your Design and Tech class. HOWEVER if you had the skis set up for sailing in the shallow water, where a landyacht starts to slow and sprays you with water!!!!!!!! Can I suggest you build a Lefroy mini(plans are here on the site) I think that in itself would be a great project for what you are doing. Also when you say have skiis to "hydroplane" on the thin water do u mean having 2 back skiis and 1 front skii?
You talk about sails and rigging, most sailing clubs, have members with boats that they no longer use cluttering up their boat houses, and other individuals have them under their houses or in their garages. If the Chassis has no A frame , ie like the Lefroy Mini, then a " traditional " bom set up works fine. When you project gets further along try posting in the the general section to ee if anybody can donate an old sail or sell one really cheap for your project. Cam- if you used an unmodified sail and boom from a windsurfer that would give you the clearance to sit up higher due to the shape of the sail- but the downside is it makes your centre of gravity higher(tried it myself), a plus is that you can pick up the sail, mast and boom dirt cheap from most council recycling yards or from local windsurfers who have given up on the sport, or have more gear than they can use and will give some away for a good cause. The seat can be found at the recycling yard- or your school might have a few damaged chairs stacked away you can scrounge! I would recommend building a lake lefroy mini- and make an extra set of rear axles with skis attached instead of wheels, mount the skis so they can flex on pivots of some sort. Front ski could be mounted on the same shaft as the front wheel after you take the wheel off (the wheel is only held on by a pin) but the geometry of the steering might mean using a small universal joint (taken from the steering column of a car) to keep the ski flat on the ground when you turn the steering.
I would imagine that skis could be picked up from a recycling yard too- there are several sets of skis at our local yard- and we are in western australia where snow is a bit scarce!

I shouldnt worry about getting a sail yet becuase it should be fairly easy to find one and easy to install. As you intend using your yacht on sand- I would be looking for the widest wheelbarrow wheels you can find, for the rear skis scrap my original idea and use a similar system as I proposed for the front axle's ski- just take off the rear wheels by removing thier retaining pins, slide off the wheels, and slide on the skis which could be mounted on a simple collar which fits over the axle shaft and is also held in place by the retaning pin. The one real advantage you have is your school should have a fully equipped machine shop with lathes, milling machines, welding equipment of all types, drill presses and a bunch of very experienced teachers who want to show off how good they are at using them. If your teachers are anything like the ones I had at school- there will be more than one landyacht pushed out of your school workshop! If slowing down before executing a turn is what is desired a front brake would logically seem to be the way to go as it will not cause imbalance. Oe thing to consider isthat the CM of a human is the pelvis, as your legs weigh around half of your total mass, roughly.
He said the craft is similar to a sailboat and uses some of the same concepts that allow a plane to land. He said the research done to build this craft could have an impact on clean energy research done in the future, though wind-powered automobiles are probably not feasible.
They started the project with the aid of Joachim Grenestedt, a mechanical engineering and mechanics professor, and became intrigued by the complexities of building a land yacht.
Such size is necessary because the wing has to be very large in order to capture enough wind power to move the land yacht to high speeds, and the bottom portion of the land yacht must be very wide in order to keep the craft from tipping over, he said. I would have hoped that if you are at year 12 level you would have come across some things like "gravity" and "friction" if you haven't google them before you start. Some advice in life for everyone "never steal some one elses design and claim it to be your own" it's not good form! Just a general question where the sail ends and the boom is why do they have an extra triangle section of sail under that where all the ropes go why don't they just have the ropes running directly under the boom? I was thinking along similar lines recently, as far as I know no one has given it a go yet.
If you tried to bolt a ski on the front axle without a uni-joint of some type, when you try to turn the rear of the ski would dig into the ground and the front of the ski would be pointing up in the air.
Looking at yours I first thought they were a dig in the ground type but seemed to be the wrong way round. What we have learned through 10 years of racing, is that the CM must be at the centroid of the triangle between the wheel hubs, for optimum stability and forward drive.
I know the sail is involved in changing the rolling moment, and contributes to moving the CM as you heel over, but to me you need to move your body shell forward quite a way. Once you get a rolling moment established, you look like you are 'falling out the back of the machine'.

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